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1da177e4 LT |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License as published by | |
4 | * the Free Software Foundation; either version 2 of the License, or | |
5 | * (at your option) any later version. | |
6 | * | |
7 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
8 | */ | |
4fc268d2 RD |
9 | |
10 | #include <linux/capability.h> | |
1da177e4 LT |
11 | #include <linux/errno.h> |
12 | #include <linux/types.h> | |
13 | #include <linux/socket.h> | |
14 | #include <linux/in.h> | |
15 | #include <linux/kernel.h> | |
1da177e4 LT |
16 | #include <linux/timer.h> |
17 | #include <linux/string.h> | |
18 | #include <linux/sockios.h> | |
19 | #include <linux/net.h> | |
20 | #include <linux/spinlock.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
1da177e4 LT |
22 | #include <net/ax25.h> |
23 | #include <linux/inet.h> | |
24 | #include <linux/netdevice.h> | |
25 | #include <linux/if_arp.h> | |
26 | #include <linux/skbuff.h> | |
27 | #include <net/sock.h> | |
28 | #include <asm/uaccess.h> | |
1da177e4 LT |
29 | #include <linux/fcntl.h> |
30 | #include <linux/mm.h> | |
31 | #include <linux/interrupt.h> | |
01d7dd0e | 32 | #include <linux/list.h> |
1da177e4 LT |
33 | #include <linux/notifier.h> |
34 | #include <linux/proc_fs.h> | |
35 | #include <linux/seq_file.h> | |
36 | #include <linux/stat.h> | |
1da177e4 | 37 | #include <linux/sysctl.h> |
bc3b2d7f | 38 | #include <linux/export.h> |
1da177e4 LT |
39 | #include <net/ip.h> |
40 | #include <net/arp.h> | |
41 | ||
42 | /* | |
43 | * Callsign/UID mapper. This is in kernel space for security on multi-amateur machines. | |
44 | */ | |
45 | ||
f16f3026 | 46 | static HLIST_HEAD(ax25_uid_list); |
1da177e4 LT |
47 | static DEFINE_RWLOCK(ax25_uid_lock); |
48 | ||
f16f3026 | 49 | int ax25_uid_policy; |
1da177e4 | 50 | |
70868eac RB |
51 | EXPORT_SYMBOL(ax25_uid_policy); |
52 | ||
d13fda85 | 53 | ax25_uid_assoc *ax25_findbyuid(kuid_t uid) |
1da177e4 | 54 | { |
01d7dd0e | 55 | ax25_uid_assoc *ax25_uid, *res = NULL; |
1da177e4 LT |
56 | |
57 | read_lock(&ax25_uid_lock); | |
b67bfe0d | 58 | ax25_uid_for_each(ax25_uid, &ax25_uid_list) { |
d13fda85 | 59 | if (uid_eq(ax25_uid->uid, uid)) { |
01d7dd0e RB |
60 | ax25_uid_hold(ax25_uid); |
61 | res = ax25_uid; | |
1da177e4 LT |
62 | break; |
63 | } | |
64 | } | |
65 | read_unlock(&ax25_uid_lock); | |
66 | ||
01d7dd0e | 67 | return res; |
1da177e4 LT |
68 | } |
69 | ||
70868eac RB |
70 | EXPORT_SYMBOL(ax25_findbyuid); |
71 | ||
1da177e4 LT |
72 | int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax) |
73 | { | |
01d7dd0e | 74 | ax25_uid_assoc *ax25_uid; |
01d7dd0e | 75 | ax25_uid_assoc *user; |
1da177e4 LT |
76 | unsigned long res; |
77 | ||
78 | switch (cmd) { | |
79 | case SIOCAX25GETUID: | |
80 | res = -ENOENT; | |
81 | read_lock(&ax25_uid_lock); | |
b67bfe0d | 82 | ax25_uid_for_each(ax25_uid, &ax25_uid_list) { |
1da177e4 | 83 | if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) { |
d13fda85 | 84 | res = from_kuid_munged(current_user_ns(), ax25_uid->uid); |
1da177e4 LT |
85 | break; |
86 | } | |
87 | } | |
88 | read_unlock(&ax25_uid_lock); | |
89 | ||
90 | return res; | |
91 | ||
92 | case SIOCAX25ADDUID: | |
d13fda85 EB |
93 | { |
94 | kuid_t sax25_kuid; | |
1da177e4 LT |
95 | if (!capable(CAP_NET_ADMIN)) |
96 | return -EPERM; | |
d13fda85 EB |
97 | sax25_kuid = make_kuid(current_user_ns(), sax->sax25_uid); |
98 | if (!uid_valid(sax25_kuid)) | |
99 | return -EINVAL; | |
100 | user = ax25_findbyuid(sax25_kuid); | |
01d7dd0e RB |
101 | if (user) { |
102 | ax25_uid_put(user); | |
1da177e4 | 103 | return -EEXIST; |
01d7dd0e | 104 | } |
1da177e4 LT |
105 | if (sax->sax25_uid == 0) |
106 | return -EINVAL; | |
107 | if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL) | |
108 | return -ENOMEM; | |
109 | ||
01d7dd0e | 110 | atomic_set(&ax25_uid->refcount, 1); |
d13fda85 | 111 | ax25_uid->uid = sax25_kuid; |
1da177e4 LT |
112 | ax25_uid->call = sax->sax25_call; |
113 | ||
114 | write_lock(&ax25_uid_lock); | |
01d7dd0e | 115 | hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list); |
1da177e4 LT |
116 | write_unlock(&ax25_uid_lock); |
117 | ||
118 | return 0; | |
d13fda85 | 119 | } |
1da177e4 LT |
120 | case SIOCAX25DELUID: |
121 | if (!capable(CAP_NET_ADMIN)) | |
122 | return -EPERM; | |
123 | ||
01d7dd0e | 124 | ax25_uid = NULL; |
1da177e4 | 125 | write_lock(&ax25_uid_lock); |
b67bfe0d | 126 | ax25_uid_for_each(ax25_uid, &ax25_uid_list) { |
01d7dd0e | 127 | if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) |
1da177e4 | 128 | break; |
1da177e4 LT |
129 | } |
130 | if (ax25_uid == NULL) { | |
131 | write_unlock(&ax25_uid_lock); | |
132 | return -ENOENT; | |
133 | } | |
01d7dd0e RB |
134 | hlist_del_init(&ax25_uid->uid_node); |
135 | ax25_uid_put(ax25_uid); | |
1da177e4 LT |
136 | write_unlock(&ax25_uid_lock); |
137 | ||
01d7dd0e | 138 | return 0; |
1da177e4 LT |
139 | |
140 | default: | |
141 | return -EINVAL; | |
142 | } | |
143 | ||
144 | return -EINVAL; /*NOTREACHED */ | |
145 | } | |
146 | ||
147 | #ifdef CONFIG_PROC_FS | |
148 | ||
149 | static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos) | |
f16f3026 | 150 | __acquires(ax25_uid_lock) |
1da177e4 | 151 | { |
1da177e4 | 152 | read_lock(&ax25_uid_lock); |
b512f3d8 | 153 | return seq_hlist_start_head(&ax25_uid_list, *pos); |
1da177e4 LT |
154 | } |
155 | ||
156 | static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
157 | { | |
b512f3d8 | 158 | return seq_hlist_next(v, &ax25_uid_list, pos); |
1da177e4 LT |
159 | } |
160 | ||
161 | static void ax25_uid_seq_stop(struct seq_file *seq, void *v) | |
f16f3026 | 162 | __releases(ax25_uid_lock) |
1da177e4 LT |
163 | { |
164 | read_unlock(&ax25_uid_lock); | |
165 | } | |
166 | ||
167 | static int ax25_uid_seq_show(struct seq_file *seq, void *v) | |
168 | { | |
f75268cd RB |
169 | char buf[11]; |
170 | ||
1da177e4 LT |
171 | if (v == SEQ_START_TOKEN) |
172 | seq_printf(seq, "Policy: %d\n", ax25_uid_policy); | |
173 | else { | |
b512f3d8 | 174 | struct ax25_uid_assoc *pt; |
1da177e4 | 175 | |
b512f3d8 | 176 | pt = hlist_entry(v, struct ax25_uid_assoc, uid_node); |
d13fda85 EB |
177 | seq_printf(seq, "%6d %s\n", |
178 | from_kuid_munged(seq_user_ns(seq), pt->uid), | |
179 | ax2asc(buf, &pt->call)); | |
1da177e4 LT |
180 | } |
181 | return 0; | |
182 | } | |
183 | ||
56b3d975 | 184 | static const struct seq_operations ax25_uid_seqops = { |
1da177e4 LT |
185 | .start = ax25_uid_seq_start, |
186 | .next = ax25_uid_seq_next, | |
187 | .stop = ax25_uid_seq_stop, | |
188 | .show = ax25_uid_seq_show, | |
189 | }; | |
190 | ||
191 | static int ax25_uid_info_open(struct inode *inode, struct file *file) | |
192 | { | |
193 | return seq_open(file, &ax25_uid_seqops); | |
194 | } | |
195 | ||
9a32144e | 196 | const struct file_operations ax25_uid_fops = { |
1da177e4 LT |
197 | .owner = THIS_MODULE, |
198 | .open = ax25_uid_info_open, | |
199 | .read = seq_read, | |
200 | .llseek = seq_lseek, | |
201 | .release = seq_release, | |
202 | }; | |
203 | ||
204 | #endif | |
205 | ||
206 | /* | |
207 | * Free all memory associated with UID/Callsign structures. | |
208 | */ | |
209 | void __exit ax25_uid_free(void) | |
210 | { | |
01d7dd0e | 211 | ax25_uid_assoc *ax25_uid; |
1da177e4 LT |
212 | |
213 | write_lock(&ax25_uid_lock); | |
ae1b6a31 | 214 | again: |
b67bfe0d | 215 | ax25_uid_for_each(ax25_uid, &ax25_uid_list) { |
01d7dd0e RB |
216 | hlist_del_init(&ax25_uid->uid_node); |
217 | ax25_uid_put(ax25_uid); | |
ae1b6a31 | 218 | goto again; |
1da177e4 | 219 | } |
1da177e4 LT |
220 | write_unlock(&ax25_uid_lock); |
221 | } |